CA1055122A - Welding apparatus for joining coils of strip steel - Google Patents
Welding apparatus for joining coils of strip steelInfo
- Publication number
- CA1055122A CA1055122A CA261,281A CA261281A CA1055122A CA 1055122 A CA1055122 A CA 1055122A CA 261281 A CA261281 A CA 261281A CA 1055122 A CA1055122 A CA 1055122A
- Authority
- CA
- Canada
- Prior art keywords
- strip steel
- coil
- strip
- welding machine
- width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/08—Seam welding not restricted to one of the preceding subgroups
- B23K11/087—Seam welding not restricted to one of the preceding subgroups for rectilinear seams
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
WELDING APPARATUS FOR JOINING
COILS OF STRIP STEEL
Abstract of the disclosure In a welding machine used on a continuous processing line of strip steel such as continuous mill line or conti-nuous annealing line for welding the leading end of the following coil to the trailing end of the proceeding coil to provide a continuous section of the strip steel to the line, there is provided a pair of clamping mechanisms for clamping the coil ends to be joined and at least one of the clamping mechanisms is adapted to be movable in the width direction of the strip so as to provide, in combi-nation with a strip width detecting unit, an automatic edge aligning arrangement. In addition to the automatic edge aligning arrangement, there is provided, at the entry end of the welding machine, a coarse edge aligning apparatus which comprises clamp means for clamping the leading end of the following coil and detecting means for detecting the center of the width of the leading end of the follow-ing coil.
COILS OF STRIP STEEL
Abstract of the disclosure In a welding machine used on a continuous processing line of strip steel such as continuous mill line or conti-nuous annealing line for welding the leading end of the following coil to the trailing end of the proceeding coil to provide a continuous section of the strip steel to the line, there is provided a pair of clamping mechanisms for clamping the coil ends to be joined and at least one of the clamping mechanisms is adapted to be movable in the width direction of the strip so as to provide, in combi-nation with a strip width detecting unit, an automatic edge aligning arrangement. In addition to the automatic edge aligning arrangement, there is provided, at the entry end of the welding machine, a coarse edge aligning apparatus which comprises clamp means for clamping the leading end of the following coil and detecting means for detecting the center of the width of the leading end of the follow-ing coil.
Description
Back~ound of the invention ; ` ~he present invention relates to a ~elding apparatus .of the type used in the entry section of a continuous processing line of strip steel for ~oining the ends of coils of strip steel, and more particularly the inventlon relates to an automatic edge alignlng arrangement which i8 designed for use in combination with such uelding machine.
: Continuous processing lines of strip steel such as continuous mill lines or continuous annealing lines are conventionally operated in such a manner that the . steel strip is rapidly fed to the line by one of a plura-lity of payoff reel units arranged in the entry section of the line to store the strip in the looper on the line, while on tbe other hand any off-gauge portion in the leading end of another coil steel fed by the following payoff reel unit is cut away and prepared for joining, so that as soon as the trailing end of the said proceeding coil i9 uncoiled, any off-gauge portion in the trailing end is cut away and the two ends are joined by welding to provlde continuous section of the strip steel to the main proce-ssing section of the line, thus preventing the occurrence of stopping of the operation of the line.
A disadvantage of the above arrangement i~ that in the case of a line such as a high speed continuous annealing line for sheet-gauge coil stocks where the storage time Or the entry-end looper is not sufficient and the line to which coils sre to be fed requires a high degree of accuracy for the edge aligmnent of the coil ends, it - - 2 ^
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has been the practice to manuslly accomplish the required edge alignment of the coil ends of strip steel with the resulting difficulty in obtaining the necessary operators and tendency to increase the down time of the entry section of the line.
Summar,y of the invention With a view to overcoming the foregolng difficulty, lt is an object of the present invention to provide a welding machine for joining coils of strip steel incorpo-rating an improved automatic edge aligning arrangement which comprises the clamping mechanisms of the welding machine itself to accomplish fine adjusting strip edge alignment, thus greatly contributing toward the full automation of the entry-end process line.
There is thus provided an automatic edge aligning arrangernent for coil strip welding machines wherein after the completion of the preparatory trimming operations including the shearing of off-gauge portions, the trailing end of the coil being passed through the line and the leading end of the following coil are respectively clamped by their associated clamping mechanisms with the welding electrodes being positioned therebetween and the coil ends thus clamped by the clamping mechanisms are joined together by welding while the stock amount of the procee-ding coil stored in the looper on the line being fed out for the processing purposes. The automatic edge aligning arrangement comprises the clamping mechanisms arranged respectively at the entry and exit parts of the weldlng , ., ., , . . `., ` , ` ' ' ~, , -... :
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machine and at least one of the clamping mechanisms i8 adapted to be movable in the width direction of the strlp steel so as to align the proceeding and following coll ends clamped by the clamping mechanisms in such a manner that their center lines coincide in relation to the wldth directlon. The arrangement further comprises a strip width detecting unit which is provided on the movable clamping mechanism to detect the center line positlon of the width of the strip steel and thereby to control the amount of movemènt of the movable clamping mechanism.
- It is a further ob~ect of the present invention to provide such improved automatic edge aligning arrange-ment for welding machines of the above type which comprises, in addition to such fine adjusting unit for aligning the center of the proceeding and following coil ends in the strip width direction at the entry side of the welding machine, a plurality of additional clamp unlts which are equsl in number to the payoff reels and arranged in overlapping relation with each other, a pinch roll unlt provided at the entry side of each of the clamp units, the clamp units and the pinch roll units constituting a coarse edge aligning apparatus for moving the clamp units in the width direction of the strip steel in such a manner that the central position of the width of the leading end of the following coil which has been trimmed for preparatory purposes, is aligned with the corresponding central positlon of the trailing end of the proceeding coil while the proceeding coil is being passed through the line prior to its clamping, and a coarse width detecting unit for cont-rolling the operation of the coarse edge aligning apparatus.
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These and further obejcts snd advantaees of thls invention will become apparent from the following more detailed description of an illustratlve embodiment of the invention, which will now be glven in conjunction Nith the accompanying drawings.
~rief description of the drawin~s Fig. 1 is a longitudinal sectional view of an entire welding machine according to an embodiment of the invention taken along the line of the processing line, Fig. 2 is a partial sectional view of the welding machine viewed in the direction of the line from the entry side, Fig. 3 shows an embodiment of a strip width detec-ting unit, with (a) showing its plan view, (b) a front view and (c) an enlarged viewtaken along the line A-A
of the preceding view, Fig. 4 is a partial sectional view of a coarse -~
edge aligning apparatus provided at the entry end of the welding machine taken along the line of the processing line, Fig. 5 is a partial ~ectional view of the coarse edge aligning apparatus viewed in the direction of the line from the exit side, and Fig. 6 is a partial sectional view of the coarse --edge aligning apparatus viewed from the entry side of the welding machine.
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Description of the preferred e!nbodiments In Fig. 1 showing a welding machine according to an embodiment of this invention, an arrow 1 indicates the direction of travel of the strip steel fed to a continuous processing line from payoff reels, and the welding machine is provided with a psir of clamping mechanisms 3a and 3b arranged in the front and back of a pair of welding electrodes 2a and 2b which àre arranged vertically on the opposite sides of the line.
The welding electrodes 2a and 2b are mounted on a holder 6 which is pivotally attached to a frame 5 by rollers 4 so that the coil ends can be welded together in the width direction by the pivotally movement of the electrode hol-der 6. The clamping mechanisms 3a and 3b include upper clampers 9a and 9b which are respectively moved vertically through link motions ~a and 8b by a common cylinder unit 7 and lower clampers 12a and 12b which are respectively pivoted through operating levers lla and llb by separate cylinder units lOa and lOb so that the head edges of the upper clampers 9a and 9b and the lower clampers 12a and 12b are opened and closed. One of these clamping mecha-nisms which in the illustrated embodiment is the entry clamping mechanism ~b, is adapted to be movable in the width direction of strip steel, so that with the following coil end clamped by the upper and lower clampers 9b and 12b, the clampine mechanism 3b i9 moved in the width direction of the strip to position the following coil end in such a mnnner that its center line is aliened with that of the proceeding coil end which is clamped by the exit clamping .
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mechanism 3a. Of course, the exit clamplng mechanlsm 3a may be made movsble in place of the entry clamping mecha-nism 3b or alternately both of these clamping mechanisms may be made movable.
In other words, the entry clamping mechanism 3b comprises the upper and lower clampers 9b and 12b, the operating lever llb and the cylinder unit lOb whlch are all mounted on a supporting structure 13 mounted on the frame 5 to be slidable in the strip width direction, and the movement of the supporting structure 13 in the width direction of strip stèel is accomplished by connecting one ends of shafts 14 which are extended through the ~ides of the frame 5 and fixedly held in place to a cylinder unit 15 which is com~ected at its one end to the frame 5. To permit the movement of the supporting structure 13 in the width direction of strip steel, as shown in Fig. 2, the link motion 8b for vertically moving the upper clamper 9b has its lifting rod 18 axially slidably mou~ted on a stay 19 whose ends are fixedly mounted on the supporting structure 13 with a predetermined spscing therebetween.
As shown in detail in Fig. 3, the entry clamping mechanism 3b is also provided with a strip width detecting j unit 20 which detects and generates in the form of an electric signal the central position of the width of the strlp steel fed into the clamping mechanism 3b.
In other words, a~ shown in Fig. 3, the strip width detec-ting unit 20 includes a detector proper 22 suspended from a spline shaft 21 which i~ supported on the frame 5 to extend in the strip width direction and tAe detector .
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proper 22 is movable only in the axial directlon of the spline shaft 21. The detector proper 22 includes a differential transformer 24 through which is extended an iron core 23 secured to the frame 5, a motor 25 which i8 rotatable in either direction and a speed reducing gear 26. In addition, there are provided a pinion 27, a pair of racks 28a and 28b which are in mesh with the pinion 27 and a pair of end plates 29a and 29b which will be pressed against the edges of strip steel. The strip width detecting unit 20 operates as follows.
The motor 25 19 operated until the end plates 29a and 29b are pressed against the edges of the strip steel and the differential transformer 24 generates an electric signal representin6 the position of the detector proper 22 which is always positioned at the middle point between the end plates 29a and 29b. Thus, the widthwise center position of the strip steel c~mped by the clamping mechanism 3b is generated as a position signal of the detector proper
: Continuous processing lines of strip steel such as continuous mill lines or continuous annealing lines are conventionally operated in such a manner that the . steel strip is rapidly fed to the line by one of a plura-lity of payoff reel units arranged in the entry section of the line to store the strip in the looper on the line, while on tbe other hand any off-gauge portion in the leading end of another coil steel fed by the following payoff reel unit is cut away and prepared for joining, so that as soon as the trailing end of the said proceeding coil i9 uncoiled, any off-gauge portion in the trailing end is cut away and the two ends are joined by welding to provlde continuous section of the strip steel to the main proce-ssing section of the line, thus preventing the occurrence of stopping of the operation of the line.
A disadvantage of the above arrangement i~ that in the case of a line such as a high speed continuous annealing line for sheet-gauge coil stocks where the storage time Or the entry-end looper is not sufficient and the line to which coils sre to be fed requires a high degree of accuracy for the edge aligmnent of the coil ends, it - - 2 ^
,, : . . . : . : , : -- , : . .. ..
has been the practice to manuslly accomplish the required edge alignment of the coil ends of strip steel with the resulting difficulty in obtaining the necessary operators and tendency to increase the down time of the entry section of the line.
Summar,y of the invention With a view to overcoming the foregolng difficulty, lt is an object of the present invention to provide a welding machine for joining coils of strip steel incorpo-rating an improved automatic edge aligning arrangement which comprises the clamping mechanisms of the welding machine itself to accomplish fine adjusting strip edge alignment, thus greatly contributing toward the full automation of the entry-end process line.
There is thus provided an automatic edge aligning arrangernent for coil strip welding machines wherein after the completion of the preparatory trimming operations including the shearing of off-gauge portions, the trailing end of the coil being passed through the line and the leading end of the following coil are respectively clamped by their associated clamping mechanisms with the welding electrodes being positioned therebetween and the coil ends thus clamped by the clamping mechanisms are joined together by welding while the stock amount of the procee-ding coil stored in the looper on the line being fed out for the processing purposes. The automatic edge aligning arrangement comprises the clamping mechanisms arranged respectively at the entry and exit parts of the weldlng , ., ., , . . `., ` , ` ' ' ~, , -... :
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machine and at least one of the clamping mechanisms i8 adapted to be movable in the width direction of the strlp steel so as to align the proceeding and following coll ends clamped by the clamping mechanisms in such a manner that their center lines coincide in relation to the wldth directlon. The arrangement further comprises a strip width detecting unit which is provided on the movable clamping mechanism to detect the center line positlon of the width of the strip steel and thereby to control the amount of movemènt of the movable clamping mechanism.
- It is a further ob~ect of the present invention to provide such improved automatic edge aligning arrange-ment for welding machines of the above type which comprises, in addition to such fine adjusting unit for aligning the center of the proceeding and following coil ends in the strip width direction at the entry side of the welding machine, a plurality of additional clamp unlts which are equsl in number to the payoff reels and arranged in overlapping relation with each other, a pinch roll unlt provided at the entry side of each of the clamp units, the clamp units and the pinch roll units constituting a coarse edge aligning apparatus for moving the clamp units in the width direction of the strip steel in such a manner that the central position of the width of the leading end of the following coil which has been trimmed for preparatory purposes, is aligned with the corresponding central positlon of the trailing end of the proceeding coil while the proceeding coil is being passed through the line prior to its clamping, and a coarse width detecting unit for cont-rolling the operation of the coarse edge aligning apparatus.
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These and further obejcts snd advantaees of thls invention will become apparent from the following more detailed description of an illustratlve embodiment of the invention, which will now be glven in conjunction Nith the accompanying drawings.
~rief description of the drawin~s Fig. 1 is a longitudinal sectional view of an entire welding machine according to an embodiment of the invention taken along the line of the processing line, Fig. 2 is a partial sectional view of the welding machine viewed in the direction of the line from the entry side, Fig. 3 shows an embodiment of a strip width detec-ting unit, with (a) showing its plan view, (b) a front view and (c) an enlarged viewtaken along the line A-A
of the preceding view, Fig. 4 is a partial sectional view of a coarse -~
edge aligning apparatus provided at the entry end of the welding machine taken along the line of the processing line, Fig. 5 is a partial ~ectional view of the coarse edge aligning apparatus viewed in the direction of the line from the exit side, and Fig. 6 is a partial sectional view of the coarse --edge aligning apparatus viewed from the entry side of the welding machine.
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Description of the preferred e!nbodiments In Fig. 1 showing a welding machine according to an embodiment of this invention, an arrow 1 indicates the direction of travel of the strip steel fed to a continuous processing line from payoff reels, and the welding machine is provided with a psir of clamping mechanisms 3a and 3b arranged in the front and back of a pair of welding electrodes 2a and 2b which àre arranged vertically on the opposite sides of the line.
The welding electrodes 2a and 2b are mounted on a holder 6 which is pivotally attached to a frame 5 by rollers 4 so that the coil ends can be welded together in the width direction by the pivotally movement of the electrode hol-der 6. The clamping mechanisms 3a and 3b include upper clampers 9a and 9b which are respectively moved vertically through link motions ~a and 8b by a common cylinder unit 7 and lower clampers 12a and 12b which are respectively pivoted through operating levers lla and llb by separate cylinder units lOa and lOb so that the head edges of the upper clampers 9a and 9b and the lower clampers 12a and 12b are opened and closed. One of these clamping mecha-nisms which in the illustrated embodiment is the entry clamping mechanism ~b, is adapted to be movable in the width direction of strip steel, so that with the following coil end clamped by the upper and lower clampers 9b and 12b, the clampine mechanism 3b i9 moved in the width direction of the strip to position the following coil end in such a mnnner that its center line is aliened with that of the proceeding coil end which is clamped by the exit clamping .
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mechanism 3a. Of course, the exit clamplng mechanlsm 3a may be made movsble in place of the entry clamping mecha-nism 3b or alternately both of these clamping mechanisms may be made movable.
In other words, the entry clamping mechanism 3b comprises the upper and lower clampers 9b and 12b, the operating lever llb and the cylinder unit lOb whlch are all mounted on a supporting structure 13 mounted on the frame 5 to be slidable in the strip width direction, and the movement of the supporting structure 13 in the width direction of strip stèel is accomplished by connecting one ends of shafts 14 which are extended through the ~ides of the frame 5 and fixedly held in place to a cylinder unit 15 which is com~ected at its one end to the frame 5. To permit the movement of the supporting structure 13 in the width direction of strip steel, as shown in Fig. 2, the link motion 8b for vertically moving the upper clamper 9b has its lifting rod 18 axially slidably mou~ted on a stay 19 whose ends are fixedly mounted on the supporting structure 13 with a predetermined spscing therebetween.
As shown in detail in Fig. 3, the entry clamping mechanism 3b is also provided with a strip width detecting j unit 20 which detects and generates in the form of an electric signal the central position of the width of the strlp steel fed into the clamping mechanism 3b.
In other words, a~ shown in Fig. 3, the strip width detec-ting unit 20 includes a detector proper 22 suspended from a spline shaft 21 which i~ supported on the frame 5 to extend in the strip width direction and tAe detector .
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proper 22 is movable only in the axial directlon of the spline shaft 21. The detector proper 22 includes a differential transformer 24 through which is extended an iron core 23 secured to the frame 5, a motor 25 which i8 rotatable in either direction and a speed reducing gear 26. In addition, there are provided a pinion 27, a pair of racks 28a and 28b which are in mesh with the pinion 27 and a pair of end plates 29a and 29b which will be pressed against the edges of strip steel. The strip width detecting unit 20 operates as follows.
The motor 25 19 operated until the end plates 29a and 29b are pressed against the edges of the strip steel and the differential transformer 24 generates an electric signal representin6 the position of the detector proper 22 which is always positioned at the middle point between the end plates 29a and 29b. Thus, the widthwise center position of the strip steel c~mped by the clamping mechanism 3b is generated as a position signal of the detector proper
2? of the strip width detecting unit 20 in relation to a reference point of the frame 5. While, in the illust-rated embodi~ent, the exit clamping mechanism 3a is also provided with a similar strip width detecting unit 30 80 that the cylinder unit 15 i9 controlled by a control unit (not shown) in such a m&nner that the position signals from the two detecting units become equal to each other, it is needless to say that in the case of a line where the widthwise position of the strip steel at the exit-end clamping mechanism portion or the trailing end of the coil belng passed previously through the line is almost the same at all times owine to the specifications of other .
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In tbe illustrated embodiment, a coarse edge aligning apparatus shown in Figs. 4, 5 and 6 ls provlded at the entry slde from the welding machlne constructed as described above. More speclfically, two-high clamp unlts 32a and 32b, two-high pinoh roll units 33a and 33b, means for moving these clamp units in the wldth direction of strip steel and two-high coarse strip width detectlng units 34a and 34b are operatively connected to the entry end of the weldlng machine through a deflector roll 31, and these two groups of units constitute feed lines 35a and 35b for the coil stocks from the two payoff reel units (not shown). In other words, if the proceeding coil is being fed through the line 35a, the following coil which has been trimmed for preparatory purposes is entered into the line 35b and brought to the position of the clamping mechanism 32b of this invention prior to the welding operation. The pinch roll unit 33b pinches and feeds the leading end of the following coil which has been trimmed as mentioned earlier to the clamping mecha-nism 3b at the entry end of the welding machine through the exit clamp units 32b, and the pinching of the strip steel effected by the associated cylinder unit 42b, as shown in Fig. 6, is released as soon as the leading end of the following coil reaches the welding position, after which the leading end of the following coil i3 clamped by the clamping mechanism 3b.
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The upper and lower clamp units 32a and 32b which clamp the strip steel of following coil at a position ln front of the entry end of the welding machine, comprlse respectively cla~pers 37a and 37b which are respectively opened and closed by cylinder units 36a and 36b and mounted by means of shafts 38a and 38b, respectively, on a common supporting structure 39 which is movable in the width direction of strip steel and the movement of the supporting structure 39 is effected by means of a cylinder unit 41 mounted on a base 40 as shown in Fig. 5. The coarse strlp width detecting units 34a and 34b respectively including a pair of light projector and receiver assemblies 43a, 44a and 43b, 44b, respectively are provided at the entry side of the pinch roll units 33a and 33b, respectively, so as to be respectively directed to the side edges of the strip steel. These units constitute an automatic coar9e edge aligning appsratus so that when the central position of the following coil strip being conducted through the line 35b, for e~ample, i- detected, in response to the resulting electric signal a control unit (not shown) controls and operates through the actuating cylinder unit 41 the clamp unit 32b illcluding the clamper 37b clamping the leading end of the following coil in the width direction of the strip steel.
In the above-described part of the welding machine of this invention, the leading end portion of the follow-. ,~
ing coil which has been subjected to trimming operation~including the ~hearing of off-gauge portions while the proceeding coil was being fed through the line, i8 clamped by the clamp unit at the entry side of the welding machine , `
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and the coarse width aligning operation is effected by the automatic coarse edge ali6ning apparatus to.move the following coil in the width direction thereof snd align its widthwise center position with that of the proceeding coil being pas~ed through the line, while on the other hand the proceedlng coil is uncoiled until the trailing end portion of the proceeding coll ~ust before the off-gauge portion i8 payed off thus storlng a sufficient amount of the strip in the looper and the off-gauge portion is sheàred off at that positlon by the shear of the welding machine thus rewinding the cut off strlp onto the reel for disposal as scrap and the thus prepared trailing coil end is clamped by the clamping mechanism at the exit end of the welding machine.
Thereafter, the leading end of the following coil which -~ has been moved to the position of the clamper through the pinch roll unit of the automatic coarse edge alig-ning apparatus, is moved further by this pinch roll unit into and clamped by the clamping mechanism at the entry end of the welding machine and then either the entry clamping mechanism or the exit clamping mechanism is moved in accordance with the output of the strip width detectine unit in such a manner that the widthwise centers of the two coll ends are aligned with each other.
Thereafter, the weldlng electrodes are pressed agalnst *~ each other to weld the coil ends together.
.,~ , After the welding has been completed, the clamping mechanlsms, the clamp units and the pinch roll units are released altogether 80 that the leading end of the following coil now connected to the trailing end of the ,:
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proceeding coil i9 fed through the line and the continued feeding of the coil strip during the welding operatlon is ensured by the looper at the entry position of the main process section. While, in the above-described embodiment, the widthwise center of the following coil end is ali&ned with that of the proceeding coil end instea-ding of using the line center, this is due to the fact that ln the case of ordinary coils, the method of alig-ning the strip coils according to their widthwise posl-tions which are more ad~.ptable to the line and thus ensu-ring smooth passage of the strip is easier than one in which the strip is passed according to the line center.
However, even if the trailing and leading ends of the coils are warped considerably in the case where the strip is passed according to the line center, satisfactory results can still be obtained by the machine of the invention by moving both of the fine adjustment clamping mechanisms of the welding machine so as to effect the required adjustments.
Thus, in accordance with the present invention, the above-described series of operations can be automated in a siMple sequence and moreover by providing, if necessary, the coarse edge aligning apparatus of this invention at the entry end of the welding machine on a high speed processing line, the desired aligning can be .:~
accomplished more accurately and rapidly thus conside-rably reducing the down time of the welding machine.
Still further, by virtue of the fact that the desired ; alienment of coil ends can be accomplished by means of the clamplng mechanisms of the welding machine itself, ._ ' .
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the provision of any additional equipment for aligningpurposes is not needed and thus the length of the llnc is prevented from becoming undesirably largs.
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In tbe illustrated embodiment, a coarse edge aligning apparatus shown in Figs. 4, 5 and 6 ls provlded at the entry slde from the welding machlne constructed as described above. More speclfically, two-high clamp unlts 32a and 32b, two-high pinoh roll units 33a and 33b, means for moving these clamp units in the wldth direction of strip steel and two-high coarse strip width detectlng units 34a and 34b are operatively connected to the entry end of the weldlng machine through a deflector roll 31, and these two groups of units constitute feed lines 35a and 35b for the coil stocks from the two payoff reel units (not shown). In other words, if the proceeding coil is being fed through the line 35a, the following coil which has been trimmed for preparatory purposes is entered into the line 35b and brought to the position of the clamping mechanism 32b of this invention prior to the welding operation. The pinch roll unit 33b pinches and feeds the leading end of the following coil which has been trimmed as mentioned earlier to the clamping mecha-nism 3b at the entry end of the welding machine through the exit clamp units 32b, and the pinching of the strip steel effected by the associated cylinder unit 42b, as shown in Fig. 6, is released as soon as the leading end of the following coil reaches the welding position, after which the leading end of the following coil i3 clamped by the clamping mechanism 3b.
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The upper and lower clamp units 32a and 32b which clamp the strip steel of following coil at a position ln front of the entry end of the welding machine, comprlse respectively cla~pers 37a and 37b which are respectively opened and closed by cylinder units 36a and 36b and mounted by means of shafts 38a and 38b, respectively, on a common supporting structure 39 which is movable in the width direction of strip steel and the movement of the supporting structure 39 is effected by means of a cylinder unit 41 mounted on a base 40 as shown in Fig. 5. The coarse strlp width detecting units 34a and 34b respectively including a pair of light projector and receiver assemblies 43a, 44a and 43b, 44b, respectively are provided at the entry side of the pinch roll units 33a and 33b, respectively, so as to be respectively directed to the side edges of the strip steel. These units constitute an automatic coar9e edge aligning appsratus so that when the central position of the following coil strip being conducted through the line 35b, for e~ample, i- detected, in response to the resulting electric signal a control unit (not shown) controls and operates through the actuating cylinder unit 41 the clamp unit 32b illcluding the clamper 37b clamping the leading end of the following coil in the width direction of the strip steel.
In the above-described part of the welding machine of this invention, the leading end portion of the follow-. ,~
ing coil which has been subjected to trimming operation~including the ~hearing of off-gauge portions while the proceeding coil was being fed through the line, i8 clamped by the clamp unit at the entry side of the welding machine , `
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," ,~ ' : ` ' `: '`
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and the coarse width aligning operation is effected by the automatic coarse edge ali6ning apparatus to.move the following coil in the width direction thereof snd align its widthwise center position with that of the proceeding coil being pas~ed through the line, while on the other hand the proceedlng coil is uncoiled until the trailing end portion of the proceeding coll ~ust before the off-gauge portion i8 payed off thus storlng a sufficient amount of the strip in the looper and the off-gauge portion is sheàred off at that positlon by the shear of the welding machine thus rewinding the cut off strlp onto the reel for disposal as scrap and the thus prepared trailing coil end is clamped by the clamping mechanism at the exit end of the welding machine.
Thereafter, the leading end of the following coil which -~ has been moved to the position of the clamper through the pinch roll unit of the automatic coarse edge alig-ning apparatus, is moved further by this pinch roll unit into and clamped by the clamping mechanism at the entry end of the welding machine and then either the entry clamping mechanism or the exit clamping mechanism is moved in accordance with the output of the strip width detectine unit in such a manner that the widthwise centers of the two coll ends are aligned with each other.
Thereafter, the weldlng electrodes are pressed agalnst *~ each other to weld the coil ends together.
.,~ , After the welding has been completed, the clamping mechanlsms, the clamp units and the pinch roll units are released altogether 80 that the leading end of the following coil now connected to the trailing end of the ,:
, . . , : . ,, ., . , , : .
, ' ' .,' "~ , :, , , :, .
proceeding coil i9 fed through the line and the continued feeding of the coil strip during the welding operatlon is ensured by the looper at the entry position of the main process section. While, in the above-described embodiment, the widthwise center of the following coil end is ali&ned with that of the proceeding coil end instea-ding of using the line center, this is due to the fact that ln the case of ordinary coils, the method of alig-ning the strip coils according to their widthwise posl-tions which are more ad~.ptable to the line and thus ensu-ring smooth passage of the strip is easier than one in which the strip is passed according to the line center.
However, even if the trailing and leading ends of the coils are warped considerably in the case where the strip is passed according to the line center, satisfactory results can still be obtained by the machine of the invention by moving both of the fine adjustment clamping mechanisms of the welding machine so as to effect the required adjustments.
Thus, in accordance with the present invention, the above-described series of operations can be automated in a siMple sequence and moreover by providing, if necessary, the coarse edge aligning apparatus of this invention at the entry end of the welding machine on a high speed processing line, the desired aligning can be .:~
accomplished more accurately and rapidly thus conside-rably reducing the down time of the welding machine.
Still further, by virtue of the fact that the desired ; alienment of coil ends can be accomplished by means of the clamplng mechanisms of the welding machine itself, ._ ' .
-` . '', :'' ' ' . ', ', '.. " " :',' " '' ',. ~ ,:
~, ' . :
1055~ZZ `
the provision of any additional equipment for aligningpurposes is not needed and thus the length of the llnc is prevented from becoming undesirably largs.
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Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a coil strip steel joining welding machine wherein the trailing end of a proceeding coil strip steel and the leading end of a following coil strip steel are clamped and joined together by welding to provide a continuous section of strip steel, an improvement comprising an automatic edge aligning arrangement to the welding machine, said automatic edge aligning arrangement comprising: a pair of clamping mechanism respectively provided at the entry and exit sides of said welding machine, at least one of said clamping mechanisms being movable in the width direction of strip steel; means for moving said movable clamping mechanism in such a manner that the center lines of the width of said clamped coil ends are aligned with each other; and strip width detecting means detecting the center line position of the width of the strip steel for controlling the amount of movement of said movable clamping mechanism.
2. In a coil strip steel joining welding machine wherein the trailing end of a preceeding coil of strip steel and the leading end of a following coil of strip steel are clamped and joined by welding to provide a continuous section of strip steel, an improvement comprising an automatic edge aligning arrangement comprising: a pair of clamping mechanisms respectively provided at the entry and exit sides of said welding machine, each clamping mechanism including upper and lower clamping members, supporting means supporting at least one of said clamping mechanisms for movement in the width direction of the strip steel; means for moving said movable clamping mechanism to align the center lines of the width of said clamped coil ends with each other; strip width detecting means for detecting the center line position of the width of the strip steel for controlling the amount of movement of said movable clamping mechanism; means for opening and closing the clamping members of said one clamping mechanism including link means comprising a lifting rod and a supporting shaft slidably supporting said lifting rod thereon, said supporting shaft having ends spaced from one another by a predetermined distance and secured to the supporting means.
3. In a coil strip steel joining welding machine wherein the trailing end of a preceeding coil of strip steel and the leading end of a following coil of strip steel are clamped and joined together by welding to provide a continuous section of strip steel, an improvement comprising an automatic edge aligning arrangement comprising: a pair of clamping machanisms respectively provided at the entry and exit sides of said welding machine, each clamping mechanism including upper and lower clamping members, supporting means supporting at least one of said clamping mechanisms for movement in the width direction of the strip; steel means for moving said movable clamping mechanism to align the center lines of the width of said clamped coil ends with each other; and strip width detecting means for detecting the center line position of the width of the strip steel for controlling the amount of movement of said movable clamping mechanism; said strip width central position detecting means including a differential transformer including an iron core fixedly attached to the frame of said welding machine and extending through said differential transformer, a reversible motor, a speed reduction gear with an output shaft coupled to said motor, a pinion mounted on said output shaft, a pair of displaceable racks meshed with said pinion, and a pair of end plates respectively attached to the outer ends of said pair of racks to be moved relative to one another by rotation of said pinion for contacting the edges of the strip of said clamped coil end, said differential transformer being fixed centrally between said pair of end plates and including means for generating an electrical signal representative of the central position between said end plates.
4. In a coil strip steel joining welding machine wherein the trailing end of a preceeding coil of strip steel and the leading end of a following coil of strip steel are clamped and joined together by welding to provide a continuous section of strip steel, an improvement comprising an automatic edge aligning arrangement comprising: a pair of clamping mechanisms respectively provided at the entry and exit sides of said welding machine, each clamping mechanism including upper and lower clamping members, supporting means supporting at least one of said clamping mechanism for movement in the width direction of the strip steel;
means for moving said movable clamping mechanism to align the center lines of the width of said clamped coil ends with each other; strip width detecting means for detecting the center line position of the width of the strip steel for controlling the amount of movement of said movable clamping mechanism; a coarse edge aligning means including a deflector roll mounted in front of the entry side of said welding machine, a pair of clamp means disposed adjacent said deflector roll and arranged one above the other, means for moving said clamp means in the width direction of the strip steel, a pair of pinch roll units arranged one above the other, a pair of coarse strip width detecting means arranged one above the other, and a pair of feeding lines for two coils of strip steel.
means for moving said movable clamping mechanism to align the center lines of the width of said clamped coil ends with each other; strip width detecting means for detecting the center line position of the width of the strip steel for controlling the amount of movement of said movable clamping mechanism; a coarse edge aligning means including a deflector roll mounted in front of the entry side of said welding machine, a pair of clamp means disposed adjacent said deflector roll and arranged one above the other, means for moving said clamp means in the width direction of the strip steel, a pair of pinch roll units arranged one above the other, a pair of coarse strip width detecting means arranged one above the other, and a pair of feeding lines for two coils of strip steel.
5. Welding machine according to claim 4 wherein said clamp means selectively clamp the leading end of the following coil of strip steel, and wherein said clamp means are mounted as a unit on a supporting structure movable over the base of said welding machine.
6. Welding machine according to claim 4 wherein the pinch roll units of said coarse edge aligning apparatus are positioned to selectively feed the leading end of the following coil of strip steel to said clamping mechanism at the entry end of said welding machine.
7. Welding machine according to claim 4 wherein each of said coarse strip width detecting means includes a pair of light projector and receiver assemblies directed towards the side edges of the associated one of said feeding lines.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11556075A JPS5239550A (en) | 1975-09-26 | 1975-09-26 | Automatic width fit up device of steel band connecting welding machine |
| JP11555975A JPS5239549A (en) | 1975-09-26 | 1975-09-26 | Automatic width fit up device of steel band connecting welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1055122A true CA1055122A (en) | 1979-05-22 |
Family
ID=26454054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA261,281A Expired CA1055122A (en) | 1975-09-26 | 1976-09-15 | Welding apparatus for joining coils of strip steel |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4067489A (en) |
| AU (1) | AU503233B2 (en) |
| BR (1) | BR7606358A (en) |
| CA (1) | CA1055122A (en) |
| DE (1) | DE2642583B2 (en) |
| FR (1) | FR2325447A1 (en) |
| IT (1) | IT1074436B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4854493A (en) * | 1986-02-28 | 1989-08-08 | Kawasaki Steel Corporation | Method and apparatus for cutting welding steel strips |
| ES2043123T3 (en) * | 1990-01-20 | 1993-12-16 | Thyssen Industrie | PROCEDURE AND DEVICE TO WELD ONE WITH ANOTHER STEEL SHEET THROUGH A LASER RAY WELDING PROCEDURE. |
| US5062566A (en) * | 1990-09-21 | 1991-11-05 | Sigmund Ege | Automated carrier-strip splicer |
| DE4100302C1 (en) * | 1991-01-08 | 1992-02-06 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg, De | |
| FR2756504B1 (en) * | 1996-11-29 | 1999-05-07 | Kvaerner Clecim | AUTOMATIC MACHINE FOR CROSS-CONNECTION OF METAL STRIPS |
| US5992726A (en) * | 1998-01-08 | 1999-11-30 | Iron Bay | Apparatus and method for setting welding run-off tabs in a coil end joiner |
| US6244494B1 (en) | 1999-06-11 | 2001-06-12 | Iron Bay, Inc. | Apparatus and method for leveling the clamping surface to provide proper heat sink for narrow strips in coil end joiner |
| KR20090038197A (en) * | 2007-10-15 | 2009-04-20 | 현대자동차주식회사 | Welding system |
| DE102008063277A1 (en) * | 2008-12-29 | 2010-07-08 | Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh | Method and device for joining metal strips |
| CN102744545B (en) * | 2012-06-21 | 2015-02-25 | 武汉凯奇特种焊接设备有限责任公司 | Laser welder |
| CN104439738A (en) * | 2014-11-07 | 2015-03-25 | 武汉钢铁(集团)公司 | Method for welding oriented silicon steel through Taylor welder and enabling weld joint to smoothly pass through rolling mill |
| CN110977338B (en) * | 2019-11-25 | 2021-06-04 | 中国航发沈阳黎明航空发动机有限责任公司 | Integration method of tailor-welded structure air inlet casing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3096919A (en) * | 1961-08-14 | 1963-07-09 | Goodyear Tire & Rubber | Web guide |
| US3247354A (en) * | 1962-09-26 | 1966-04-19 | Taylor Winfield Corp | Method and apparatus for aligning strip in strip joining equipment |
| US3257060A (en) * | 1963-03-01 | 1966-06-21 | Federal Warco Division | Apparatus for welding metal strip |
-
1976
- 1976-09-15 CA CA261,281A patent/CA1055122A/en not_active Expired
- 1976-09-15 US US05/723,479 patent/US4067489A/en not_active Expired - Lifetime
- 1976-09-16 AU AU17810/76A patent/AU503233B2/en not_active Expired
- 1976-09-22 DE DE2642583A patent/DE2642583B2/en not_active Ceased
- 1976-09-24 FR FR7628833A patent/FR2325447A1/en active Granted
- 1976-09-24 BR BR7606358A patent/BR7606358A/en unknown
- 1976-09-24 IT IT27643/76A patent/IT1074436B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT1074436B (en) | 1985-04-20 |
| US4067489A (en) | 1978-01-10 |
| AU1781076A (en) | 1978-03-23 |
| AU503233B2 (en) | 1979-08-30 |
| FR2325447A1 (en) | 1977-04-22 |
| DE2642583B2 (en) | 1981-05-07 |
| DE2642583A1 (en) | 1977-03-31 |
| FR2325447B1 (en) | 1980-10-24 |
| BR7606358A (en) | 1977-05-31 |
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